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Milk in mixture = 60 x 90% = 54 L Water in mixture = 60 x 10% = 6 L Let's assume that water is added in the mixture is x Liters. Now mixture is = (60 + x) After addition water = (60 + x) According to the question: (60 + x) x 75% = 54 60+ x = (54 × 100)/75 60+ x = 18 x 4 x=72-60 x = 12 Liters
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